The Good Filter Company standard duty electrostatic furnace filter and air conditioning filter is more efficient and longer lasting than other electrostatic filters. It is a more rigid and denser filter than other standard duty electrostatic air filters and unlike other electrostatic filters, all the material in this filter is made to be washed. This electrostatic furnace filter and air conditioning filter is made of 1 ply of unique, rigid, fibrous, self charging filter media, then encapsulated by 2 layers of fine mesh polypropylene electrostatic filter fabric and 2 layers of heavy duty expanded aluminum face grid. The inner air filter media, unique to Good Filter Company, is rigid and self-charging for excellent sturdiness and superior efficiency. Then comes 2 layers of fine mesh, self charging polypropylene electrostatic filter fabric for more small particulate capturing and holding capacity. Finally, 2 layers of heavy duty expanded aluminum face grid for protection of the inner layers and the capturing of large particles, making this filter a no-wrinkle and no-stretch, very sturdy and efficient residential and commercial electrostatic air filter. Unlike other manufacturer’s electrostatic air filters, the Good Filter Company standard duty electrostatic filter washes clean with no buildup of residual particles, keeping air resistivity at a minimum. No one else makes an electrostatic filter like this one. The Good Filter Company standard duty electrostatic furnace filter and air conditioning filter is available in 37 standard sizes and is also available in custom sizes up 2000 square inches. Our 1″ electrostatic furnace filters and air conditioning filters with any dimension larger than 20 x 25 may have a center brace for added strength, another Good Filter Company quality addition not found on other electrostatic air filters.